Annual report pursuant to Section 13 and 15(d)

Revenue from Contracts with Customers (Costs to Obtain a Contract with a Customer) (Details)

v3.19.1
Revenue from Contracts with Customers (Costs to Obtain a Contract with a Customer) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Revenue from Contract with Customer [Abstract]        
Contract acquisition costs, net $ 80,726 $ 0   $ 61,340
Increase in contract acquisition costs 19,386      
Amortization of contract acquisition costs $ 9,671 $ 0 $ 0